Petrol supply pumping mechanism for internal combustion engines



I Dec. 3, 1940. w. CULL 2,223,675

PETROL SUPPLY PUMPING MECHANISM FOR INTERNAL COMBUSTION ENGINES Filed Dec. 28, 1939 2 Sheets-Sheet 1 mun 9 2 2 3 r X /2 7 r 1 l4 /2 I do I um 7 ATM.

Wc'ZZc'am Cull,

Dec. 3, 1940. w. CULL 2,223,675

PETROL SUPPLY PUMPING MECHANISM FOR INTERNAL COMBUSTION ENGINES Filed Dec. 28, 1959 2 Sheets-Sheet 2 mm jig-[Z 3 I V/ l I 5| I 4 l///////// 4 /l A a II I 1 //a [9 Q y 5 m\\\\\\ 1 \7/ S l l l /2 Q I4 E mm Patented Dec. 3, 1940 UNITED STATES PETROL SUPPLY PUMPING MECHANISM FOR 7 INTERNAL COMBUSTION ENGINES William Cull, Shipley, England, assignor to Scott Motors (Saltaire) Limited, Shipley, England Application December 28, 1939, Serial No. 311,401 In Great Britain July 6, 1938 4 Claims.

This invention relates to pumps of the diaphragm or bellows type commonly used upon internal combustion engines for pumping petrol to thecarburetor, and in which the diaphragm or 5 bellows, hereinafter termed diaphragm, during its positive suction stroke draws petrol through an inlet valve into a chamber and during the delivery stroke, usually under spring pressure, forces it through a non-return outlet valve to the carburetor. The chief object of the present invention is to provide a pump of this type which will be adapted to pump liquids, say of different viscosities such for example as petrol and oil, in predetermined proportions and deliver them mixed together to the carburetor,

According to the invention the pump diaphragm has connected thereto a means adapted to inject into the chamber or other space a predetermined quantity of oil at each stroke of the diaphragm. This means is'preferably of hollow construction and provided with a valve so that at each stroke of the diaphragm said means delivers a predetermined quantity of oil into the petrol drawn into the chamber by the diaphragm.

Preferably means are also provided for agitating the oil and petrol in the chamber to ensure their thorough mixing.

In one form of the invention the ratio of the quantities of' petrol and oil delivered into the chamber will be in accordance with the relative volumetric displacement of the diaphragm and said injecting means, or in accordance with the relation between their effective areas when their strokes are the same.

In order that the invention may be clearly understood and readily carried intoefiect, the same will now be more 'fully described with reference to and by the aid of the embodiments illustrated in'the accompanying drawings, wherein:

Figure 1 is a part sectional elevation of a pumping mechanism."

Figure 2 is a similar view to Figure 1 but illustrates a modified form of pumping mechanism.

Figure 3 is a sectional detail view of the vane and its tubular support.

Figure 4 illustrates an alternative construction.

Referring to Figure 1 of. the drawings, the

pump consists of a diaphragm l mounted in a casing 2 which may be secured to the engine (not shown). The casing 2' aiiords a receiving and discharging chamber 3 which will be provided with an inlet passage3ll in which is mounted a non-returninlet valve, through which petrol or other liquid is introduced into the chamber 3. The casingalso has an outlet passage 3| in which is mounted a non-return outlet valve, through which the mixture in the chamber 3 is discharged." The openings 30 and 3| and thevalves 5 therein are preferably situated diametrically opposite one another with the petrol inlet opening 39 at the lowest point in the discharge chamber 3 and with the mixture outlet opening 3i vertically opposite or at the top of said cham 10 per 3 so that any'oil which, due to separation, collects when the pump has stood inactive for any period will be in the direct line of the stream of petrol when the pump is'started up, and since this stream has a comparatively high velocity it 15 assists in producing a uniform mixture at the initial period oi running. The diaphragm l is directly connected to the operating means, which in this form of the invention constitutes a pump plunger 4 mounted in the pump '20 casing 2, said plunger l being reciprocated by any suitable means, such as a bell crank lever or rocker arm 5 operated by a cam 6 driven by the engine (not shown). A helical spring 1 of suit- 25 able tension abuts against the diaphragm l and the fixed casing 2 'sothat whilst the diaphragm l is positively operated on the suction stroke, the

. actual delivery head from the diaphragm can be controlled by suitable return spring pressure. 30 The operatingplunger l is hollow at H and is. extended so as to work'within a cylindrical bore afforded in the pump casing 2,said plunger t having a non-return inlet valve 8 at, its free end, and in this latter connection the valve 8 35 com-prises a spring-loaded ball 9 held against a restricted inlet ii] in the end of the extended plunger.

The working space 3a of the plunger pump has a valve controlled inlet connected to the usual oil supply of the engine (not shown) so that when the diaphragm I is operated and petrol is drawn into the chamber 3, oil is forced through the inlet Lalong the bore H of the pump plunger 4, and injected into the. chamber 3. In order to 45 ensure the agitationand thorough mixing of the two fluids in the chamber 3, avaned disc I2 is secured tothat end of the operating plunger 4 which projects into the chamber 3, and the vanes on said disc 12 are preferably set at an angle of 50 approximately 40 so that the axial movement of the diaphragm I and plunger element" 4 will be imparted to the vanes which in turn will impart to thefluids an alternative right and left hand swirling motion. Additional turbulence. of 55 placing pressure isreleased. 1

' 10 In other Words, the tension of the'spring i4 acts with the spring 1 to oppose the inward movement of the diaphragm I when'the latter 'is dis placed and these springs coact to return the diaphragm to its normalposition when the dis- The diameter of the pump plunger W is "such in relation to that of the diaphragm! that "a suitable ratio of oil'and petrol is sfipplidto and mixed in the chamber 3. v I In the modified construction of pumping mechanism-shown in Figure 2, in which like references toitho'se 'in Figure 1 indicate like or yanamgo s parts, oil is j'sup'plied from the engine "under pressure from aprimary pump -(not "s houni) fandthis-i'nitial oil-pressure is utilised to control and effect the'actual delivery head from the diaphragm. The pumping means 4. is.

of hollow construction and at its free end is adapted to work within aicylindrical member 5 "whichis engaged by the rocker arm ,5. .Transferports or oilways 1.8. are formed in the cylindrical member [5 which are adapted toconnect and disconnect the initial pressure oil supply ports IT with and from'theinlet ports H! of the 1 =hollow means 4.1 The free, end of the means .4 .is hollowed out at I9 and open to the in'itial oil pressure supply so that the means-4f is fo rce d ,to ;bear a ainst the cylindrical member {5 and cause hev att rio en a the ker ar 5-.

Z fi r 2 th hd h aemu S the c mineawm t e l er Stroke of h jgliaphragmi. 'Ifhei initial epresses. acting upon the means 6 causes the diaphrag m to'eonimence oi IWayS lGifltdfgififiT'With the ports: IT ofithe "flied Easing 2 "andf'theinlet' ports l'8of the free end 'of "the means "fifth'us "allowing the 'oil' to pass into the bo'reof the 'hollowplun'ger. The rocker 'arm then 'commences'to return the cylindrical member I5andthe latterengagesand iiiv'es the means 4 so that"p'etrol'flowsflinto' the ch her and "along the hollo'w means 4 through "the ports I 3 into the chamber 3 where 'th'Va'Iid "iiisc l2agitatesand n oroughiymxes the petrol h .7 I a,

-It'vvill bes'eemthatthepumpihg of 'the' petrol "byth'diaphragm'is entirely dependent up'on'the initial oil pressure being supplied to the means, I sothat in the event of the engine oil puinp fail- "TGOfing; the" efr'iginewill' 0t run 'owingto the stop- "ping brthe etrorpurnpg Y I j Figure 41 shows" arr example of new variable -raltios may be obtained byalteringthe relative f strokes "of the'fdia'p'hragm and the oil pump pl'unger. The diaphragm-is operated by a'rocker arm flil'an'dthei reciprocation of the former is transmitted to the oil pump plunger d through *the medium of a pair-of pivotally mounted levers F zl having 'between them" an adjustable bowl or ;rtirinier 731i; operating-in such a manner that fvfherr the; latter is centrally "placed; as shown said figure, the efiective flengths of {the levers i and consequently {the "strokes of 7 the'-- diai'phragm 3 an plunger d'aref equal,-and'-by--ad- 75 "jun-rag the "runner 28- to any 'eccntrid'position,

fiienvryjahd at the same time bring thep'orts or member.

the efiective length of one lever is increased as the other is decreased and vice Versa, according to the direction of movement of the said runner 28, so that the stroke of the oil pump-'- ing plunger 4 is varied in relation to that of 5 the diaphragm. t

I claim: V

1. In-a pumping arrangement of the type specified, the combination with the positively actuated diaphragm pump for pumping a liquid into 1 and from a chamber of a plunger pump for pumping a "second liquid into said chamber, a

varied disc in the latter which partakes of the Vmovements of the diaphragm to impart swirling motion tothe liquids to ensure thorough mixing, 15 a' conduit connecting the workingspace of the plunger pump to the chamber, a non-return valve'in said conduit, and an operative connection between the diaphragm and the plunger so that for each suction stroke of the diaphragm a predetermined :quantity of the first liquid is drawn into the'chamber by the diaphragm-and a predetermined quantity of the second liquid is injected into the chamber-by the; plunger, and that for 'eachreturn-stroke of the'diaphragmthe two liquids mixed in their predeterminedproportion,are1forcedfrom the chamberand'awfresh charge-of the second liquidenters the working space" of the plunger pump. 7

2. In a pumpingmechanismof thetype speci- 1'30 fled, thecombination with the positively actuated diaphragm-v pump' for pumping a' liquid into andffrom "a chamber, of-a means-for controlling the'flow of' a second liquid into said "chamber,

which second liquid-is supplied underpressurerg to the means, a conduit formed. through the means and connecting the Working-spaceofthe the hollow means, and transfer ports" in the cylin-' dricahmember adaptedto "connect andidiscon- 'nect'initial pressure -liquid*-supply' ports withand from the means inlet pcrts accor'ding-tothe movement of the positively operated actuating '3. 'In a pumping mechanism of the class' described, the combination with a casing'fhavinga chamber therein; said: Casihgbeir'ig'provided 'with valve controlledinlet and'outl'et openings; a posiinto' the chamben'throughsa'id inletppening,

means for effecting "theflow of ai'Se'CO-Iid "liouid 'co "into said chamber, said' casing -having a'working space associated with said" means,a"passage communicating the working space with" said chamber, a valve means a'ssociatedwith. said means and "passage'for controlling' the*fiow of said second fluid so as to prevent'fits reverse flow,

' means for operating said means arid-saiddia- I phragm in one direction so that when saiddia- 1 phragm draws a predetermined quantity of --liq- --uid into said chamber, th'e first mentionedn eanswill efie'ct the ihjectionof a predeterminedquan- 't'ity o fthesecondliquid into said chamber, rn'eans for moving said -"dia phragm-= and firsti m'en-tioned 1 means' inthe'opposite df' ecti'on, andfm'e'ans for *a'gitati'ngthe n'li 'xture in' 'said ohamben 'the move-l'ig ment of the diaphragm in the last mentioned direction efiecting the operation of the agitating means and the discharge of the mixture from the chamber.

4. In a pumping mechanism of the class described, the combination with a casing having a chamber therein, said casing being provided With valve controlled inlet and outlet openings, a positively actuated diaphragm for drawing a liquid into the chamber through said inlet opening, a plunger for pumping a second liquid into said chamber, said casing having a Working space associated with said plunger, said plunger having a passage therein communicating the working space with said chamber, a non-return valve in said passage for controlling the flow of the sec-- ond liquid therethrough, means for operating said plunger and said diaphragm in one direction so that when said diaphragm draws a predetermined quantity of liquid into said chamber, the plunger will effect the injection of a predetermined quantity of the second liquid into said chamber through said passage, and means for moving said diaphragm and plunger in the opposite direction, the movement of the diaphragm in the last mentioned direction effecting the discharge of the mixed liquids from the chamber. WILLIAM CULL. 

